# Metrics in PromQL

You can use either the Query Builder, or PromQL to build the expression for each metric. **Metrics Explorer** defaults to using **Query Builder**.

When you are already familiar with PromQL, this method of building queries may be quicker and more natural.

To learn how to use PromQL for your queries, see [Querying Prometheus](https://prometheus.io/docs/prometheus/latest/querying/basics/).

To use PromQL, switch to the **PromQL** mode to define the metric by clicking the **Code** icon, , at the end of the line.

To revert to using the expression builder, switch to **\*Builder** mode by clicking the **Builder** icon, .

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|  | See [PromQL](https://docs.kloudfuse.com/platform/3.2.5/promql/) for more information.